I think it a great pity that Harry has so little interest in history, even that of his own family, because he could have learned something from the words of his many times great grandfather (Spencer side) Charles I, meeting his children for the last time. He could have learned how the succession actually works and what is expected
"Charles then turned his attention to the eight-year-old boy sitting on his knee. For little Henry, his message was direct and uncompromising. ‘Sweetheart,' he said, ‘now they will cut off thy father's head; mark, child, what I say.' By this time, the king certainly had his youngest son's complete, even fascinated, attention. ‘They will cut off my head, and perhaps make thee a king; but mark what I say, you must not be a king, so long as your brothers, Charles and James, do live; for they will cut off thy brothers' heads (when they can catch them), and cut off thy head too at last; and therefore I charge you do not be made a king by them.' To which the child, anguished but unshaken by this gruesome depiction of his family's and his own future, burst out: ‘I will be torn in pieces first.' His reply ‘made the king rejoice exceedingly'.
(From "Royal Renegades" by Linda Porter. Charles' words well recorded at the time)